53383

Appears in sequences

• 4-dimensional analog of centered polygonal numbers.at n=21A006322
• a(n) = binomial(n+2, 2) + binomial(n+4, 5).at n=21A027658
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 21.at n=10A031699
• a(n) = 29 + 73*n + 37*n^2.at n=37A145980
• a(n) = 441n^2 + 2n.at n=10A158321
• Number of tilings of a 5 X n rectangle using n pentominoes of shapes F, I, L, U.at n=11A251617
• a(n) = binomial(n, 2) + 6*binomial(n, 4).at n=23A327319
• Centered heptagonal numbers which are sphenic numbers.at n=14A360183
• a(n) = Sum_{k=0..floor(n/3)} binomial(5*n-2*k,n-3*k).at n=5A371756